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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e9a9ef22223bcc735d31afe8d53e2817cfb6e13cc1b2695ebc283502582243' 
  AND token = 'pqeUqIxGOT1XM9OWPF9cTR8hhlUH9fRCoPfMB7vlMjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}